Google stop crawling & sending visitor after a big downtime - why?

Can anyone face this ...

[nex99]

hi..

i receive 500 unique visitors per day from google and other search engines. But 3 days ago i face a big downtime (web server down for 6 hours) and after that my site is not crawled by any major search engines + there is no new visitors referred by any search engine.

i can't understand why? Can anyone face this situation?

What should I do now? Please advice..

[NedProf]

Not one of the searchengines provide visitors? Then there's something wrong with your stats ;)

Downtime can't be the reason for a total loss of rankings in all searchengines.